Means for automatically truing the grinding-disks of circular grinding machines.



A. v. RUNDQVIST. MEANS FOR AUTOMATICALLY TRUING THE GRINDING DISKS 0F CIRCULAR GRINDING MACHINES.

' APPLICATION FILED JULY I. 1918- LQQQfiQl Patented Feb. 18, 1919.

2 SHEETS-SHEET I.

da 6 mm A. v. RUNDQVIST. MEANS FOR AUTOMATICALLY TRUING THE GRINDING DISKS 0F CIRCULAR GRINDING MACHINES.

APPLICATION FILED JULY I, I918.

1394,541 I L Patented Feb. 18, 1919.

2 SHEETS-SHEET 2- JnvenZ'ar, flIfifumi vst.

diamond or other T ip.

ANDREAS VIKTOR RUNDQVIS'I, OF STOGKHOLM, SWEDEN, ASSIGNOR T0 AKTIEBOLAGE'I PREGI SIONSVERKTYG, OF STOCKHOLM, SWEDEN.

MEAN S FOR AUTOMATICALLY TR'UING THE GBINDING-DISKS 0F CIRCULAR GRINDING- MACHINES.

earner.

' Application filed July 1, 1918. Serial No. 242,869.

To all whom it may concern Be it known that I, ANDREAS YIKTOR RUNDQVIST, a subject of the Klng of Sweden, residing at 4 Narvavagen, Stock-- holm, Sweden, have invented certain new and useful Improvements in Means for Automatically Truing the Grinding-Disks of Circular Grinding-Machines, of which the following is a specification.

As known, it is necessary to true, now and then, the grinding disk of circular grind-- ing machines, the working surface of the said grinding disk being worn out or damaged after having been used a certain time. Hitherto, it has been necessary, in truing the grinding disk, to move the same, before the beginning of the truing, 1n a direction from the workpiece to such an extent that it comes out of the path of the puppet carrying the work piece, the diamond used for the truing being then secured to the said puppet, after which the puppet is moved so that the diamond will come right before the grinding disk, which will then be trued when rotated. The method and means heretofore employed has many disadvantages due to time wasting, adjustments and the like and, consequently, it is desirable to remove these objections.

According to the present invention, which contemplates a means for automatically truing the grinding disk of circular grinding machines, the said objections are avoided by truing the disk during the grinding operation, without necessitating any interruption of the said operation. The invention consists, chiefly, of two members mounted in a frame adapted to be secured to one of the reciprocating tail stocks carrying the work piece, one of the said members carrying the finding material, while the other member 1s brought, at a certain moment of the relative movement of the,

working piece and the grinding disk, preferably at the end of the said movement,

into engagement or contact with a fixed stop, for instance the cover of the grinding .disk. Between the two said mem-'- bers suitable connecting members are arranged, the said connecting members being disposed so as to vmove, when being acted upon by one member contacting with the said stop, the other member carry- Specification of Letters Patent.

ing to the truing Patented lFeb. id, 1919..

ing the diamond or the like being moved by the connecting members to such a position that the diamond will be pressed onto the circumference of the grinding disk for truing the same along its whole width during the movement in the one direction. After the diamond has moved across the disk, the connecting members cease to act upon the, member carrying the diamond, which latter member is then, by the action of a spring, moved back to its initial position and carries the diamond outside the circumference of the grinding disk.- When the direction of movement of the working piece is reversed, the diamond will not contact with the grinding disk, the truing being thus performed only once during each reciprocation of the working piece.

According to one form of embodiment of the invention, the said members constitute spring actuated rods, of which the one carrying the diamond is rotatably connected to the frame, while the other one is s'lidably mounted in said frame.

Some further details characterizing the invention are described in the following description and shown in the annexed drawings.

Referring to the drawings Figure 1 shows schematically a plan view.

Along the frame 1 of the. grinding machine is slidably mounted thepuppet 2, to which is adjustably secured a pin 4 belong device. 7 In a head of the pin 4 is likewlse adjustably mounted a second pin 5, which carries directly the members or rods 6 and -7 belonging to the truing device. The grinding disk journaled on the shaft 8 is designated 9 and its cover 10. The grinding disk is capable of being fed to and from the working piece clamped between the puppets, the working piece be ing moved longitudinally by means of the puppets, so that the grinding 'may be performed along the whole length of the workingpiece.

The member 6, consisting according to the drawing of a rod, or the like, is rotatably mounted in a sleeve 12 adjustably connected to the head 11 of the pin 5. Mounted on the rod 6 is a ring 13, a projection, a cam or the like of which engages a slot 14 extending along the rod, preventing the ring from belng turned about the rod. Introduced into the sleeve 12 is a helical spring 15 arranged about the rod 6, said spring being at its one end in engagement with or secured to the ring 13, while the other end of the said spring is secured to a ring 16 rotatably mounted on the rod 6, said ring 16 being turnable by means of a sleeve nut 17 extending into the sleeve 12, so that, if the rod be retained in a certain position, the spring .will be stretched. In order that the sleeve nut 17 may be locked in a certain position, a lock nut 18 is*screwed on the same.

The rod 6 is provided at its one end with a holder 19, in which the pin 21 provided with the diamond 20 is held clamped by means of a screw 22 screwed into the end of the rod. At the other end of the rod 6 is detachably and adj ustably mounted an abutment 23, the function of which will be more closely described below.

To the sleeve 12 are adjustably secured by meansof screws 24, 24 bearing parts 25, 25,

in which is slidably but not rotatably mounted an iron rod 7 of circular cross-section constituting the second of the above-mentioned members, and which is normally held in a certain position (see Fig. 2) by a spring 26' arranged around the said rod and be-- tween the bearing parts. A nut 27 screwed on the one end of the rod 7 facilitates, in part, the lengthening or the shortenin of the rod. The other end of the rod is provided with a projection 28, which, when the device is used, cooperates, at certain times, with a wedge-shaped part 29 (socalled running pawl) arranged on the abutment 23, and hereby acts so that the abutment 23, the rod 6 and the pin 21 carrying the diamond 20 will be turned out of their normal position (shown in Fig. 2); r The part or the wedge 29 rojects from a pin 31 (Figs. 6, 7 and 8) slidably but not turnably mounted in a sleeve 30, said pin 31 being normally held, by means of a spring 32, 1n such position that the wedge will approximately contact with an arm 23 carrying the sleeve 30 and projecting fromthe abutment 23. The arm 23 is, in part, turnable in the abutment 23.

The said abutment 23, arranged around the one end of the rod 6, is secured in the desired position by a screw 33. The abutment consists "of two relatively movable arms 23 and 23', of which the arm 23 is rigidly connected to the rod 6, when the screw 33 has been tightened, while the arm 23 is still movable. Into the arm 23 is screwed a lock screw 34, by which the relative position of the arms may be controlled. The screws 35, 36 (Fig. 3) facilitate the adjustment and the securing of the parts on the pin 5.

The device works in the following manner: When the grinding disk has been fed forward and the truing device has been adjusted, z. e., positioned in relation to the grinding disk, the grinding operation may begin, the puppets and the working piece clamped between said puppets being thereby reciprocated laterally, so that the working piece will be caused to pass the grinding disk in the one or the other'lateral d1- rection. Immediately after the worklng piece has been moved laterally of the disk, the rod 7 is acted upon by a projection extending from the cover 10 and forming the fixed stop, the rod being thereby moved (in the direction of the arrow in Fig. 2) against the action of the spring 26, which is then compressed. During the said movement of the rod 7, the wedge 29 will be moved by the right-hand edge of-the projection 28 toward the side of the said projection (see Fig. 2), which causes a rotat on of the rod 6 against the action of the spring 5 15, so that the pin 21 carrying the diamond 20 will be turned to the posltion I shown in Fig. 3. The diamond will hereby be brought into contact with the circumference of the grinding disk so as to perform the 100 truing of the same, until the wedge 29, being in contact with the same surface of the projection'28 as is the case in Fig. 1, has reached the end of the said projection, the wedge 29 being thereby moved over the edge 105 of the said rojection and. brought into conrection' of movement. The tension of the s.

spring 26 is hereby gradually released, and

the rod 7 is moved back to its initial position by the spring, the rojection being moved, during the aforesai movement of the rod 7,

in the direction of the arrow in Fig. 4 between the arm 23 and the Wedge 29. In this case the diamond will not engage the grinding disk, when passing the same.

The operation above described will be repeated at each time the puppet carrying the truing device is moved toward and from the grindmg disk, which is consequently, automatically trued during the working operation, without necessitating any interruption of the said operation due to the moving of hardness of the working piece, a longer interruption of the truing maybe desired, so that the grinding disk will not be trued during several of the periods of movement of the working piece. I This may be attained by screwing out the screw 34. Larger displacements are attained by means of the screw 35.

Obviously, the described means may be varied as tothe details, without departing from the spirit and scope of the invention.

Having now described my invention what I claimv as new anddesire to secure by Letters Patent is 1. The combination with a' grinding machine having a grinding disk and a work piece holder movable toward. and away from the disk, of a member carried by the work piece holder and movable parallel tothe axis of the disk, grinding material carried' by said member, and means'for rocking said member to move the-grinding material to- (vivaid and away from the periphery of the 2. The combination with a grinding machine having a grinding disk and a work piece holder movable in the direction of the axis of the disk, of a rocking member carried by the work piece holder and supporting grinding material, a second member carried by the work piece holder and capable of longitudinal movement, a stop engaged by the second member when the work piece holder is moved toward the disk, and means connecting the two members for rocking the first member and bringing the grinding material into contact with the periphery of disk when the first member is engaged by said stop and moved longitudinally.

3. In a combination as defined in claim 2, springs for holding said members in normal position and for returning the same to normal position after they have been moved.

4. In a combination as defined in claim 2, means for adjusting the length of the second member. Y

5. In combination as defined in claim 2,

said second member comprising an extensi-' ble rod,

6. In combination wlth a grinding machine having a grinding disk and a work piece holder movable parallel to the axis of the disk of a rocking rod carried by said holder and having grinding material movable toward and away from the periphery of the disk, anaxially movable rodcarried by the holder, means connecting said rods for imparting rocking movement to the first rod when the other rod is moved axially, and a stop adapted to be engaged by the axially movable rod when the holder moves toward the disk. I

7. The combination with a grinding machine having a grinding disk and a work piece holder movable parallel to the axisof the disk, of a support carried by the work piece holder and movable therewith, a rod rotatably mounted in said support and carrying cgrinding material adapted to be moved towar and away from the periphery of the disk, a member secured to the rotatable rod and carrying a wedge, an axially movable rod carried by said support and provided with a projecting member for engaging the wedge when said rod is moved, and a stop engaged by the axially movable rod, when the work piece holder is moved, for moving said axially movable rod.

8. A tool grinder comprisinga rocking rod having an arm carrying grinding material, an axially movable rod, and means in operative connection with said axially movable rod for rocking said rocking rod each time the axially movable rod is reciprocated.

9. In a grinding machine, the combination with a grinding disk and a work piece holder movable toward and away from the disk, of means carried by the work piece holder and movable toward and away from the periphery of the disk, a second means carried by the work piece holder and adapted to move the first means toward and away i In testimony whereof I havehereunto affixed my signature in presence of two wit- ANDREAS VIK'IOR RUN DQVIST.

Witnesses I AXEL EHRNER, JACOB BAGGE. 

